Fuse-plug.



W. S. MAcLEWEE.

FUSE PLUG.

APPLICATION FILED NOV-23,1915.

1,243,850. Patented Oct. 23, 1917.

ilip-9 Witnesses Inventor %,/7" %9/ A, William/S. MacLewee 6M1 L J By his fltborney 30 Fig.2.

UNITED STATES PATENT OFFICE.

- WILLIAM S. MAOLEWEE, OF YARDLEY, PENNSYLVANIA, ASSIGNOB TO CARRIE HOWELL MAOLEWEE, OF YARDLEY, PENNSYLVANIA.

ruse-Imus.

I Specification of Letters Patent.

Patented Oct. 23, 1917.

Application filed November 23, 1915. Serial No. 63,042.

To all whom it may concern:

Be it known that I, WILLIAM S. Maolinwnn, a citizen of the United States, residmg at Yardley, in the county of Bucks and State of Pennsylvania, have invented certain new and useful Improvements in Fuse- Plugs, of which the following is a specification.

My invention relates to improvements in a fuse plug'and the object of my invention is to construct a fuse plug with a porcelain body portion and a metal cap, which latter is protected by the projecting flange formed at the top of the-body portion; a further object of my invention is to provide novel means for securing the metal cap upon the body portion and a still further object of my invention is to construct the body portion so that a metal shell carrying the fuse wire may be readily secured thereto.

Referring to the accompanying drawing in which like references refer to like parts;

Figure 1 is a perspective view of my 1mproved fuse plug; Fig. 2 is a vertical section of the fuse plug; Fig. 3 is a sectional perspective view of the porcelain body portion; Fig. 1 is a perspective view, partially in section, of the metal cap, detached; and

Fig. 5 is an inverted section on line 5-5,

In the drawings 1 represents the body ortion which is made of porcelain or other insulating material. The body portion 1, is provided with an enlarged flange 2, at the top thereof. The central part of the body portion is hollowforming a chamber with a cylindrical opening at the top and a cylindrical opening, somewhat reduced in size, at the bottom of the body portion.

The body portion has an annular groove 4, formed in the top surface thereof, which groove is larger in diameter than the central opening in the body portion, thus leaving a wall 5, over which fits the metal cap 6.

As shown in Figs. 3 and 5, oppositely disposed openings 8 and 9 are formed through the flange 2, which openings 8 and 9 communicate with the bottom of the groove 4 formed in the top surface of the flange. The cylindrical flange 10 of the metal cap 6, is provided with arms 12 and 13, which are adapted to be inserted through the openings 8 and 9 in the body portion 1, and the arms are bent outwardly to hold the metal cap 6 55 in place. The under side of the flange 2,

of the body portion has recesses 15 and 16,

formed therein to receive the ends of the arms 12 and 13, after they have been bent outwardly which allows them to be protected by the flange 2 and also to better hold the cement or paste 17, which is used to cover the ends of the arms 12 and 13.

The top end of the fuse plug is closed by a transparent disk 20 which also makes'the interior of the body portion visible through the aperture formed in the metal cap 6.

Upon the upper surface of the wall 5, of

the body portion are formed ribs 21, to hold the transparent disk 20 a sufiicient distance from the body portion to permit the escape of gases when the fuse wire is melted. As the cylindrical flange 10 of the' cap 6 fits loosely over the wall of the body portion there is ample ventilating space formed around the metal cap. 1

A metal shell 25 having a screw thread formed thereon is secured upon the lower end of the body portion by forcing portions of the upper edge of the metal shell into the recesses 26 and 27 formed in the body portion.""

The body portion is provided with a vertical slot 28, to receive the contact plate 30 carried by the shell 25 which allows the shell to be placed upon the lower end of the body portion. An insulating disk 31 is held between the lower end of the body portion and the flange 32 of the shell 25 and said disk 31 carries a contact button'33 to whichis attached one end of the fuse wire 35, having its other end attached to the contact arm 30 of the metal sleeve 25.

Having thus described my invention, I claim and desire to secure by Letters Patent:

1. A fuse plug comprising a body portion having a central chamber, said body portion having a groove formed in the top surface thereof, a transparent disk covering sald chamber, a metal cap to hold the transparent disk, an enlarged flange formed upon the body portion, arms formed upon the metal cap adapted to project through openings in the body portion and to be secured below the projecting flange of the body portion.

2. A fuse plug comprising a'body portion having a central chamber, said body portion having an annular groove formed in the top surface thereof, a metal cap having a cylindrical flange'adapted toenter said groove formed in the body portion, arms upon the metal cap, openings formed in the body portion extending from the bottom of the said groove to receive the arms of the metal cap, an enlarged flange formed upon the body portion, and said flange having recesses formed in the under side thereof to receive the ends of the arms of the metalcap.

3. A fuse plug comprising a body portion having a central chamber. said bodyportion having an annular groore formed in the top surface thereof forming a circular Wall around the outlet of the said chamber, ribs formed upon the top surface of the said WILLIAM S. MACLEVVEE.

Witnesses:

ROBERT M. WALLACE, EARL D. SHAI-FER. 

